The radial filter begins by summing the off-limb component of several images to increase
signal-to-noise. The corona beyond the disk is then divided into concentric rings, each
of which is scaled as a function of its radius, average brightness, and intensity relative
to neighboring rings. As such, flux is not conserved; the brightness of each pixel
corresponds only to its intensity relative to other pixels of the same radius.

Two routines are required: <aia_rfilter.pro> and <aia_rfilter_jp2gen.pro>. Detailed instructions can be found
in the header of <aia_rfilter.pro>. Both programs are now part of the main AIA SSWIDL installation and should be
included in your installation if everything is up to date. Alternatively, you can download the latest versions here: